123111213210 has 96 divisors (see below), whose sum is σ = 332903121408. Its totient is φ = 31540440960.

The previous prime is 123111213193. The next prime is 123111213227. The reversal of 123111213210 is 12312111321.

123111213210 is a `hidden beast` number, since 1 + 231 + 11 + 213 + 210 = 666.

123111213210 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (123111213193) and next prime (123111213227).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24682 + ... + 496821.

It is an arithmetic number, because the mean of its divisors is an integer number (3467740848).

Almost surely, 2^123111213210 is an apocalyptic number.

123111213210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123111213210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166451560704).

123111213210 is an abundant number, since it is smaller than the sum of its proper divisors (209791908198).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123111213210 is a wasteful number, since it uses less digits than its factorization.

123111213210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521620 (or 521617 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 123111213210 its reverse (12312111321), we get a palindrome (135423324531).

The spelling of 123111213210 in words is "one hundred twenty-three billion, one hundred eleven million, two hundred thirteen thousand, two hundred ten".